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Relationship between Partial Mn Substitution for Fe and the Temperature Sensitivity of Li-Zn-Cu Ferrite Polycrystal

2009; Volume: 33; Issue: 2 Linguagem: Inglês

10.3379/msjmag.0901rb7130

2432-0250

Masayuki Naoe, T. Omura, Masatsugu Oishi, Shinya Okazaki, Toshiro Sato, K. Yamasawa, Yoshitaka Miura,

Magnetic properties of thin films

Li-Zn-Cu ferrite polycrystal as a high-frequency ferrite is distinguished by its temperature sensitivity. In a previous paper, we pointed out that Li-ferrite, the main component of Li-Zn-Cu ferrite causes the temperature sensitivity. This result would suggest the influence of the large temperature coefficient of the anisotropy constant of Li-ferrite. The purpose of the present work is to investigate the effect of partial Mn substitution of Fe on the temperature sensitivity of Li-Zn-Cu ferrite polycrystal. While the permeability and the saturation magnetization at room temperature were reduced with greater Mn substitution, their temperature dependences were enhanced. It was clarified that the stronger temperature dependence of the apparent anisotropy field arose from partial Mn substitution and thereby intensified the temperature-dependent magnetic properties.